A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 241, SOUTH LANCASTER, MA 01561-0241
PO BOX 242, SOUTH LANCASTER, MA 01561-0242
PO BOX 243, SOUTH LANCASTER, MA 01561-0243
PO BOX 244, SOUTH LANCASTER, MA 01561-0244
PO BOX 245, SOUTH LANCASTER, MA 01561-0245
PO BOX 246, SOUTH LANCASTER, MA 01561-0246
PO BOX 247, SOUTH LANCASTER, MA 01561-0247
PO BOX 248, SOUTH LANCASTER, MA 01561-0248
PO BOX 249, SOUTH LANCASTER, MA 01561-0249
PO BOX 250, SOUTH LANCASTER, MA 01561-0250
PO BOX 251, SOUTH LANCASTER, MA 01561-0251
PO BOX 252, SOUTH LANCASTER, MA 01561-0252
PO BOX 253, SOUTH LANCASTER, MA 01561-0253
PO BOX 254, SOUTH LANCASTER, MA 01561-0254
PO BOX 255, SOUTH LANCASTER, MA 01561-0255
PO BOX 256, SOUTH LANCASTER, MA 01561-0256
PO BOX 257, SOUTH LANCASTER, MA 01561-0257
PO BOX 258, SOUTH LANCASTER, MA 01561-0258
PO BOX 259, SOUTH LANCASTER, MA 01561-0259
PO BOX 260, SOUTH LANCASTER, MA 01561-0260
PO BOX 261, SOUTH LANCASTER, MA 01561-0261
PO BOX 262, SOUTH LANCASTER, MA 01561-0262
PO BOX 263, SOUTH LANCASTER, MA 01561-0263
PO BOX 264, SOUTH LANCASTER, MA 01561-0264
PO BOX 265, SOUTH LANCASTER, MA 01561-0265
PO BOX 266, SOUTH LANCASTER, MA 01561-0266
PO BOX 267, SOUTH LANCASTER, MA 01561-0267
PO BOX 268, SOUTH LANCASTER, MA 01561-0268
PO BOX 269, SOUTH LANCASTER, MA 01561-0269
PO BOX 270, SOUTH LANCASTER, MA 01561-0270
PO BOX 271, SOUTH LANCASTER, MA 01561-0271
PO BOX 272, SOUTH LANCASTER, MA 01561-0272
PO BOX 273, SOUTH LANCASTER, MA 01561-0273
PO BOX 274, SOUTH LANCASTER, MA 01561-0274
PO BOX 275, SOUTH LANCASTER, MA 01561-0275
PO BOX 276, SOUTH LANCASTER, MA 01561-0276
PO BOX 277, SOUTH LANCASTER, MA 01561-0277
PO BOX 278, SOUTH LANCASTER, MA 01561-0278
PO BOX 279, SOUTH LANCASTER, MA 01561-0279
PO BOX 280, SOUTH LANCASTER, MA 01561-0280
PO BOX 281, SOUTH LANCASTER, MA 01561-0281
PO BOX 282, SOUTH LANCASTER, MA 01561-0282
PO BOX 283, SOUTH LANCASTER, MA 01561-0283
PO BOX 284, SOUTH LANCASTER, MA 01561-0284
PO BOX 285, SOUTH LANCASTER, MA 01561-0285
PO BOX 286, SOUTH LANCASTER, MA 01561-0286
PO BOX 287, SOUTH LANCASTER, MA 01561-0287
PO BOX 288, SOUTH LANCASTER, MA 01561-0288
PO BOX 289, SOUTH LANCASTER, MA 01561-0289
PO BOX 290, SOUTH LANCASTER, MA 01561-0290
PO BOX 291, SOUTH LANCASTER, MA 01561-0291
PO BOX 292, SOUTH LANCASTER, MA 01561-0292
PO BOX 293, SOUTH LANCASTER, MA 01561-0293
PO BOX 294, SOUTH LANCASTER, MA 01561-0294
PO BOX 295, SOUTH LANCASTER, MA 01561-0295
PO BOX 296, SOUTH LANCASTER, MA 01561-0296
PO BOX 297, SOUTH LANCASTER, MA 01561-0297
PO BOX 298, SOUTH LANCASTER, MA 01561-0298
PO BOX 299, SOUTH LANCASTER, MA 01561-0299
PO BOX 300, SOUTH LANCASTER, MA 01561-0300
PO BOX 301, SOUTH LANCASTER, MA 01561-0301
PO BOX 302, SOUTH LANCASTER, MA 01561-0302
PO BOX 303, SOUTH LANCASTER, MA 01561-0303
PO BOX 304, SOUTH LANCASTER, MA 01561-0304
PO BOX 305, SOUTH LANCASTER, MA 01561-0305
PO BOX 306, SOUTH LANCASTER, MA 01561-0306
PO BOX 307, SOUTH LANCASTER, MA 01561-0307
PO BOX 308, SOUTH LANCASTER, MA 01561-0308
PO BOX 309, SOUTH LANCASTER, MA 01561-0309
PO BOX 310, SOUTH LANCASTER, MA 01561-0310
PO BOX 311, SOUTH LANCASTER, MA 01561-0311
PO BOX 312, SOUTH LANCASTER, MA 01561-0312
PO BOX 313, SOUTH LANCASTER, MA 01561-0313
PO BOX 314, SOUTH LANCASTER, MA 01561-0314
PO BOX 315, SOUTH LANCASTER, MA 01561-0315
PO BOX 316, SOUTH LANCASTER, MA 01561-0316
PO BOX 317, SOUTH LANCASTER, MA 01561-0317
PO BOX 318, SOUTH LANCASTER, MA 01561-0318
PO BOX 319, SOUTH LANCASTER, MA 01561-0319
PO BOX 320, SOUTH LANCASTER, MA 01561-0320
PO BOX 321, SOUTH LANCASTER, MA 01561-0321
PO BOX 322, SOUTH LANCASTER, MA 01561-0322
PO BOX 323, SOUTH LANCASTER, MA 01561-0323
PO BOX 324, SOUTH LANCASTER, MA 01561-0324
PO BOX 325, SOUTH LANCASTER, MA 01561-0325
PO BOX 326, SOUTH LANCASTER, MA 01561-0326
PO BOX 327, SOUTH LANCASTER, MA 01561-0327
PO BOX 328, SOUTH LANCASTER, MA 01561-0328
PO BOX 329, SOUTH LANCASTER, MA 01561-0329
PO BOX 330, SOUTH LANCASTER, MA 01561-0330
PO BOX 331, SOUTH LANCASTER, MA 01561-0331
PO BOX 332, SOUTH LANCASTER, MA 01561-0332
PO BOX 333, SOUTH LANCASTER, MA 01561-0333
PO BOX 334, SOUTH LANCASTER, MA 01561-0334
PO BOX 335, SOUTH LANCASTER, MA 01561-0335
PO BOX 336, SOUTH LANCASTER, MA 01561-0336
PO BOX 337, SOUTH LANCASTER, MA 01561-0337
PO BOX 338, SOUTH LANCASTER, MA 01561-0338
PO BOX 339, SOUTH LANCASTER, MA 01561-0339
PO BOX 340, SOUTH LANCASTER, MA 01561-0340
PO BOX 341, SOUTH LANCASTER, MA 01561-0341
PO BOX 342, SOUTH LANCASTER, MA 01561-0342
PO BOX 343, SOUTH LANCASTER, MA 01561-0343
PO BOX 344, SOUTH LANCASTER, MA 01561-0344
PO BOX 345, SOUTH LANCASTER, MA 01561-0345
PO BOX 346, SOUTH LANCASTER, MA 01561-0346
PO BOX 347, SOUTH LANCASTER, MA 01561-0347
PO BOX 348, SOUTH LANCASTER, MA 01561-0348
PO BOX 349, SOUTH LANCASTER, MA 01561-0349
PO BOX 350, SOUTH LANCASTER, MA 01561-0350
PO BOX 351, SOUTH LANCASTER, MA 01561-0351
PO BOX 352, SOUTH LANCASTER, MA 01561-0352
PO BOX 353, SOUTH LANCASTER, MA 01561-0353
PO BOX 354, SOUTH LANCASTER, MA 01561-0354
PO BOX 355, SOUTH LANCASTER, MA 01561-0355
PO BOX 356, SOUTH LANCASTER, MA 01561-0356
PO BOX 357, SOUTH LANCASTER, MA 01561-0357
PO BOX 358, SOUTH LANCASTER, MA 01561-0358
PO BOX 359, SOUTH LANCASTER, MA 01561-0359
PO BOX 360, SOUTH LANCASTER, MA 01561-0360
PO BOX 361, SOUTH LANCASTER, MA 01561-0361
PO BOX 362, SOUTH LANCASTER, MA 01561-0362
PO BOX 363, SOUTH LANCASTER, MA 01561-0363
PO BOX 364, SOUTH LANCASTER, MA 01561-0364
PO BOX 365, SOUTH LANCASTER, MA 01561-0365
PO BOX 366, SOUTH LANCASTER, MA 01561-0366
PO BOX 367, SOUTH LANCASTER, MA 01561-0367
PO BOX 368, SOUTH LANCASTER, MA 01561-0368
PO BOX 369, SOUTH LANCASTER, MA 01561-0369
PO BOX 370, SOUTH LANCASTER, MA 01561-0370
PO BOX 371, SOUTH LANCASTER, MA 01561-0371
PO BOX 372, SOUTH LANCASTER, MA 01561-0372
PO BOX 373, SOUTH LANCASTER, MA 01561-0373
PO BOX 374, SOUTH LANCASTER, MA 01561-0374
PO BOX 375, SOUTH LANCASTER, MA 01561-0375
PO BOX 376, SOUTH LANCASTER, MA 01561-0376
PO BOX 377, SOUTH LANCASTER, MA 01561-0377
PO BOX 378, SOUTH LANCASTER, MA 01561-0378
PO BOX 379, SOUTH LANCASTER, MA 01561-0379
PO BOX 380, SOUTH LANCASTER, MA 01561-0380
PO BOX 381, SOUTH LANCASTER, MA 01561-0381
PO BOX 382, SOUTH LANCASTER, MA 01561-0382
PO BOX 383, SOUTH LANCASTER, MA 01561-0383
PO BOX 384, SOUTH LANCASTER, MA 01561-0384
PO BOX 385, SOUTH LANCASTER, MA 01561-0385
PO BOX 386, SOUTH LANCASTER, MA 01561-0386
PO BOX 387, SOUTH LANCASTER, MA 01561-0387
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